18421363 has 4 divisors (see below), whose sum is σ = 18445968. Its totient is φ = 18396760.

The previous prime is 18421357. The next prime is 18421379. The reversal of 18421363 is 36312481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18421363 - 2¹⁷ = 18290291 is a prime.

It is a super-2 number, since 2×18421363² = 678693229555538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18421303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11143 + ... + 12688.

It is an arithmetic number, because the mean of its divisors is an integer number (4611492).

Almost surely, 2^18421363 is an apocalyptic number.

18421363 is a deficient number, since it is larger than the sum of its proper divisors (24605).

18421363 is an equidigital number, since it uses as much as digits as its factorization.

18421363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24604.

The product of its digits is 3456, while the sum is 28.

The square root of 18421363 is about 4292.0115330693. The cubic root of 18421363 is about 264.1033561867.

The spelling of 18421363 in words is "eighteen million, four hundred twenty-one thousand, three hundred sixty-three".